"By shooting intense radio beams into the night sky, researchers created a modest neon light show visible from the ground. The process is not well understood, but scientists speculate it could one day be employed to light a city or generate celestial advertisements."

http://www.livescience.com/technology/050202_light_show.html

"Nothing to see here! Move along! It's PURELY for green specles in the sky and possible advertising! Off you go..."